Auto merge of #54358 - flip1995:beta, r=Manishearth

 [beta] Cancel warning for tool_lints

For the discussion about this, see: rust-lang-nursery/rust-clippy#3159

`clippy-preview` is available on stable since 1.29. So when running `cargo +beta clippy` on a crate with `#![allow(clippy_lint)]` a warning is produced, which tells the programmer to change this to `#![allow(clippy::clippy_lint)]`. But since `tool_lints` aren't stable yet, this would require a `#![feature(tool_lints)]`. Features aren't available on stable or beta, so we cannot do this. Even wrapping `cfg_attr(clippy)` around this won't help, since Clippy can also be run from stable or beta toolchain.

r? @Manishearth

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